718 Vibration Damping Effect of Structure with Damping Material on Connected Side

2006 ◽  
Vol 2006.44 (0) ◽  
pp. 289-290
Author(s):  
Akira OZASA ◽  
Hai ZHOU ◽  
Teruyuki IZUMI
Keyword(s):  
Vibration Damping ◽  
Damping Effect ◽  
Damping Material ◽  
Effect Of Structure

Preparation of modified polyvinyl formal vibration‐damping material and its application in strawberry

2021 ◽  
Author(s):  
Yiqin Zhang ◽  
Honglei Mu ◽  
Haiyan Gao ◽  
Hangjun Chen ◽  
Weijie Wu ◽  
...  
Keyword(s):  
Vibration Damping ◽  
Polyvinyl Formal ◽  
Damping Material

The Application of BESO in Vibration Damping of Ship Plate

2013 ◽  
Vol 572 ◽  
pp. 185-188 ◽  
Author(s):  
Xiao Yan Teng ◽  
Jia Shan Han ◽  
Liang Peng
Keyword(s):  
Natural Vibration ◽  
Target Function ◽  
Vibration Damping ◽  
Natural Vibration Frequency ◽  
Constraint Condition ◽  
Evolutionary Structural Optimization ◽  
Damping Material ◽  
Reasonable Result ◽  
Beso Method ◽  
Original Amount

Based on the bi-directional evolutionary structural optimization (BESO), the method of determining the adhesion position of the damping material is proposed in this paper, which is applicable to the vibration damping of ship plate. In this method, the needed amount of damping material is taken as the constraint condition, and the maximization of one natural vibration frequency of the structure is taken as the target function. A thin plate structure with both ends constraints has been taken as an example to get the best topology structure of its adhesion damper by taking the BESO method. The result of optimization shows that it still meets the damping requirements when the needed amount of damping material decreases by about 50% of the original amount. The reasonable result demonstrates the effectiveness and engineering value of the method.

Topology Optimization of Carbon Nanotube Reinforced Damping Layers

Aerospace ◽  
2005 ◽  
Author(s):  
Arnold Lumsdaine ◽  
Mohan Damu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Topology Optimization ◽  
Polymer Matrix ◽  
Vibration Damping ◽  
Constrained Layer Damping ◽  
Damping Properties ◽  
Reinforced Polymers ◽  
Damping Material ◽  
Layer Structures

Topology optimization has been successfully used for improving vibration damping in constrained layer damping structures with viscoelastic materials. Reinforcing carbon nanotubes in a polymer matrix greatly influences the mechanical properties of the polymer. Such nanotube-reinforced polymers (NRP) can be used to further enhance the damping properties of the constrained layer structures. The inclusion of nanotubes into a polymer matrix provides a new design variable in the topology optimization studies on such structures. In this work, the topology optimization of structures using such NRP as the damping material is performed. The resulting structures show a phenomenal improvement in damping. Moreover, a more efficient method is used for the optimization process.

Optimization Design on Vibration and Noise Reduction of Damping Sandwich Circular Saw

2012 ◽  
Vol 215-216 ◽  
pp. 433-437
Author(s):  
Ting Wang ◽  
Tao Yao ◽  
Guo Lin Duan
Keyword(s):  
Noise Reduction ◽  
Loss Factor ◽  
Optimization Design ◽  
Design Method ◽  
Optimal Thickness ◽  
Damping Effect ◽  
Circular Saw ◽  
Damping Material ◽  
Material Element ◽  
Damping Loss Factor

In view of the study of topology optimization design method on vibration and noise reduction of damping sandwich circular saw, the optimal thickness and layout of damping material were obtained. The optimization model of circular saw was established by using the coupling method, the optimum thickness of damping layer was found. By using ESO method, deleting elements method and modal loss factor sensitivity calculation method were obtained. Making use of modal loss factor sensitivity, ineffective elements were deleted by judging the whole structure damping effect on each damping material element, optimal configuration of damping sandwich circular saw structure under the stiffness condition was obtained, which reduced the vibration and noise and reached a certain stiffness requirements. By contrasting the damping loss factor of three different circular saw models, the results show that optimized circular saw structure has the best damping effect.

Viscoelastic Vibration Damping Materials for Application in a Temperature Range above 150°C

2017 ◽  
Vol 730 ◽  
pp. 569-573 ◽  
Author(s):  
Wen Fei Wang ◽  
Xin Zhi Lin ◽  
Yu Liang Ma
Keyword(s):  
High Temperature ◽  
Bulk Material ◽  
Vibration Damping ◽  
Temperature Range ◽  
Polymer Resin ◽  
Young’S Moduli ◽  
Damping Material ◽  
Viscoelastic Damping Material ◽  
New Type ◽  
Damping Materials

We demonstrate a new type of viscoelastic vibration damping material with high damping performances (tan δ=E′/E′′ ≥0.3 where E′ and E′′ are the storage and loss Young’s moduli, respectively) at a high temperature range between 200°C and 250°C utilizing a special polymer resin of higher glass transition temperature corresponding to the application temperature range and larger pendant groups offering higher efficiency of the energy dissipation. In addition, the damping property of the bulk material reinforced with glass fiber will be significantly improved, where the peak tan δ value can reach 0.7. In this paper, we put the emphasis on the preparation process and properties characterization of this new type material, and try to provide a new method to fabricate a viscoelastic damping material (VDM) usable for applications in the field of high temperature vibration reduction, in contrast to the conventional ones whose damping properties will dramatically decay once the ambient temperature is above 100°C.

Elastic-Plastic Analysis on Damaged Multi-Tower Isolation Structure with an Enlarged Base

2011 ◽  
Vol 255-260 ◽  
pp. 2550-2554 ◽  
Author(s):  
Nan Zhao ◽  
Hai Xia Geng ◽  
Kai Ma ◽  
Kang Ning Li
Keyword(s):  
Time History ◽  
Plastic State ◽  
Earthquake Response ◽  
Analysis Method ◽  
Plastic Hinges ◽  
Isolation Layer ◽  
Damping Effect ◽  
History Analysis ◽  
Rare Earthquake ◽  
Effect Of Structure

The analysis on earthquake response of one multi-tower isolation structure with an enlarged base in rare earthquake and aftershocks was carried out using elastic time history analysis method. It includes the damping effect of structure, plastic deformation of members and plastic hinges distribution in structure. The results show that isolation structure comes to plastic state under rare earthquake lighter, vertical elements remain flexible under earthquake aftershocks, the plastic hinges on horizontal members are deepen, but the structure can meet the requirement while it is renovated. Plastic hinges first appear in the bottom of structure, then they gradually develop upwards, Plastic hinges are generated at the ends of beams, but not occur in columns and walls. The displacement of structure under rare earthquake is mainly concentrated on isolation layer and it can take energy consumption by large displacement.

Experimental Study of Vibration Damping in a Modified Elastic Wedge of Power-Law Profile

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
J. Javier Bayod
Keyword(s):  
Power Law ◽  
High Frequency ◽  
Vibration Damping ◽  
Constant Thickness ◽  
Practical Implementation ◽  
High Frequency Range ◽  
Elastic Wedge ◽  
Frequency Range ◽  
Passive Damping ◽  
Damping Material

The objective of this research is to evaluate and propose a modified elastic wedge as passive damping system for structural damping. An elastic wedge is a plate whose thickness decreases smoothly toward zero. It has been proposed as an effective passive damping system to reduce structural vibration, especially in the high frequency range. Several authors have researched elastic wedge theory and showed that if the thickness of a plate decreases toward zero following a power law function, the flexural waves traveling in that plate do not suffer reflection along their path. That energy accumulates at the zero thickness edge, which results in a very efficient damping. In practice, manufacturing a zero thickness edge is not possible and a large amount of the wave energy is reflected at the thinner edge. However, when a small quantity of damping material is added on that edge, a very effective damping can be achieved. The damping effectiveness of the elastic wedge increases proportionally to the thinness of the edge for a given quantity of the added damping material. However, manufacturing of an elastic wedge with a very thin edge is economically costly since high precision machining is required. This presents a problem for practical implementation into the manufacturing line. In this paper, a modified elastic wedge is proposed to facilitate manufacturing and to reduce cost so that practical implementation is possible. In the proposed modified elastic wedge, the thin edge has a thickness achievable with conventional tools. Then, to increase its damping effectiveness, the thin edge is extended for some length with constant thickness. Finally, damping material is added on the extended part. Experimental and finite element method (FEM) frequency response analyses were carried out with a modified elastic wedge. The results show that the proposed modified elastic wedge can also achieve very effective vibration damping, especially in the high frequency range, while being manufactured with conventional tools. This method is currently under evaluation for noise reduction in structures of large dimensions, like platelike components of ship structures, or other machinery to reduce vibration and noise emission, and where cost and manufacturing accuracy limit the application of the conventional elastic wedge.

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